package com.qf;

/**
 * @author 孙亚梅
 * @version V1.0
 * @Project javase2203
 * @Package com.qf.controller
 * @Description:
 * @Date 2022/5/25 19:43
 */

import com.qf.pojo.Cart;
import com.qf.pojo.User;
import com.qf.service.CartService;
import com.qf.service.CartServiceImpl;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;

/**
 * 购物车管理
 */
@WebServlet("/cart")
public class CartController extends  BaseServlet {

    /**
     * 创建购物车
     *
     * @param request
     * @param response
     * @return
     */
    public String create(HttpServletRequest request, HttpServletResponse response) {
        //1:获取商品id
        String pid = request.getParameter("pid");
        //2:获取session会话中当前用户的用户id
        User user = (User)request.getSession().getAttribute("loginUser");
        if (user == null) {
            //如果获取表单用户对象，说明用户没有登录，跳转到登录页面
            return "redirect:/login.jsp";
        }

        //3:调用service业务层，将购物车存入到数据库中
        CartService cartService = new CartServiceImpl();
        cartService.createCart(user.getId(), Integer.parseInt(pid));

        //4；跳转到购物车查询列表方法
        return "redirect:/cart?method=show";


    }

    /**
     * 查询指定用户的购物车数据，并调转到购物车列表页面展示
     * @param request
     * @param response
     * @return
     */

    public String show(HttpServletRequest request, HttpServletResponse response) {
        //1；获取session会话中当前用户的id
        User user = (User) request.getSession().getAttribute("loginUser");
        if (user == null) {
            //用户未登录，重新登录
            return "redirect:/login.jsp";
        }
        //2：根据用户id调用service查询这个用户的购物车数据
          CartService cartService = new CartServiceImpl();
        List<Cart> cartList = cartService.findCartListByUid(user.getId());
        //3:将用户购物车的数据放入request域中，带到页面中进行展示
        request.setAttribute("list", cartList);
        //4：调转到购物车列表页面展示
        return  "forward:/cart.jsp";

    }

    /**
     * 修改购物车中购物项的购买数量
     * @param request
     * @param response
     * @return
     */
    public  String update(HttpServletRequest request,HttpServletResponse response){
        //1:从会话中获取当前登录用户的id，如果获取不到调转到登录页面
        User user = (User) request.getSession().getAttribute("loginUser");
        if (user == null){
            //用户未登录，重新登录
            return  "redirect:/login.jsp";
        }
        //2：获取购物项主键id参数
        String cid = request.getParameter("cid");
        //获取购买数量
        String cnum =request.getParameter("cnum");

        //3：调用service，执行修改业务
        CartService cartService = new CartServiceImpl();
        cartService.updateCart(Integer.parseInt(cid), Integer.parseInt(cnum));

        //4：跳转到购物车列表方法，查看购物车中最新的数据展示
        return "redirect:/cart?method=show";
    }

    /**
     * 根据购物项主键id删除
     * @param request
     * @param response
     * @return
     */
    public  String delete(HttpServletRequest request,HttpServletResponse response){
        //1：到session会话中获取当前登录用户对象，获取不到说明没登录，重新登录
        User user =(User) request.getSession().getAttribute("loginUser");
        if (user == null){
            //用户未登录，重新登录
            return  "redirect:/login.jsp";
        }
        //2：获取购物项主键id
        String cid = request.getParameter("cid");

        //3:调用service 根据购物项主键id删除
        CartService cartService = new CartServiceImpl();
        cartService.deleteById(Integer.parseInt(cid));

        //4：调转到购物车查询列表页面，显示最新购物项数据
        return "redirect:/cart?method=show";
    }

}